fix(async): publish released boxes when activation quiesces

[proggeramlug]

Summary

• keep released async box cells scoped to the step invocation that released them
• publish that batch immediately once the step returns and no matching resume remains queued
• preserve the outermost empty-queue quarantine as the conservative duplicate-resume fallback
• extend the immovable-source safety audit and release diagnostics for both publication gates

This is stacked on #8208 and completes the remaining activation-reachability work for #8213. No package or crate version is bumped.

Measurements

asyncpipe, best of five /usr/bin/time -l runs, with byte-identical output in every run:

BATCHES	resident box cells	base RSS	#8208 RSS	this PR RSS
30	1,635	21.92 MiB	22.44 MiB	20.84 MiB
60	1,635	28.41 MiB	29.20 MiB	27.22 MiB
1200	1,635	138.02 MiB	79.08 MiB	79.30 MiB

The resident-cell count is constant across the 40x workload range, down from #8208's 65,915-cell inter-pump residue. The strict 30/60-batch RSS floor is also below the no-release base.

Validation

• cargo test -q -p perry-runtime --lib (2,555 passed, 4 ignored)
• cargo test -q -p perry-runtime --lib release_tests -- --test-threads=1
• cargo test -q -p perry-codegen --test release_boxes_lowering
• cargo test -q -p perry-transform box_release
• python3 scripts/check_thread_locals.py
• python3 scripts/gc_root_dominance_check.py --audit-immovable-sources
• python3 scripts/gc_root_dominance_check.py --self-test
• Node/Perry exit-path fixture comparison (byte-identical stdout)

Fixes #8213

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[proggeramlug]

Closing as superseded by the current #8208 head (485925b), which landed the same #8213 per-activation publication goal with explicit queued/running activation ownership, pending-thunk generation checks, and longjmp coverage before this branch was pushed. That implementation is the stronger fix and is already mergeable against main. This duplicate intentionally made no version changes.